Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Mill Hill experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from an agreeable 21.5°C (70.7°F) in August to a refreshing 18.5°C (65.3°F). During September, the average low-temperature is a fresh 11°C (51.8°F).Humidity
In September, the average relative humidity in Mill Hill is 78%.Rainfall
In Mill Hill, during September, the rain falls for 12.4 days and regularly aggregates up to 24mm (0.94") of precipitation. Throughout the year, there are 168.8 rainfall days, and 393mm (15.47") of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 38min.On the first day of September, sunrise is at 6:14 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:40 pm BST.
Sunshine
In Mill Hill, the average sunshine in September is 7.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Avoiding the Sun during its peak radiation time around midday is a healthy practice. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Frequently asked questions
What is the usual temperature for Mill Hill in September?
What is the average humidity in September in Mill Hill?
How much does it rain in Mill Hill in September?
When it does not snow in Mill Hill?
How many hours of daylight does Mill Hill have in September?
When are sunrise and sunset in September in Mill Hill?
How long on average sun shines in September in Mill Hill?
What is the UV index reading in September in Mill Hill?
Average temperature in September
Mill Hill, United Kingdom
- Average high temperature in September: 18.5°C
The warmest month (with the highest average high temperature) is July (21.8°C).
The month with the lowest average high temperature is January (6.5°C).
- Average low temperature in September: 11°C
The month with the highest average low temperature is August (13.7°C).
The coldest month (with the lowest average low temperature) is January (1.8°C).
Average pressure in September
Mill Hill, United Kingdom
- Average pressure in September: 1016.8mbar
The months with the highest atmospheric pressure are May and September (1016.8mbar).
The month with the lowest atmospheric pressure is November (1010.5mbar).
Average wind speed in September
Mill Hill, United Kingdom
- Average wind speed in September: 12.9km/h
The windiest month (with the highest average wind speed) is February (17.8km/h).
The calmest month (with the lowest average wind speed) is July (12.8km/h).
Average humidity in September
Mill Hill, United Kingdom
- Average humidity in September: 78%
The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is August (74%).
Average rainfall in September
Mill Hill, United Kingdom
- Average rainfall in September: 24mm
The wettest month (with the highest rainfall) is December (47mm).
The driest month (with the least rainfall) is April (22mm).
Average rainfall days in September
Mill Hill, United Kingdom
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is March (12.2 days).
Average snowfall in September
Mill Hill, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (23mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Mill Hill, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Mill Hill, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 7h and 1min
The months with the most sunshine are July and August (Average sunshine: 8h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in September
Mill Hill, United Kingdom
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is September (15.3 days).
The month with the least sunshine days is February (11.4 days).
Average UV index in September
Mill Hill, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Mill Hill, United Kingdom
- Average cloud cover in September: 48
The months with the most cloud cover are February and November (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 48).
Average visibility in September
Mill Hill, United Kingdom
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and December (9km).
The month with the lowest visibility is November (8km).
Mill Hill, United Kingdom
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